Apparatus for making a yarn

Abstract

Apparatus for making a yarn comprises two juxtaposed, closely spaced apart suction drums, which are rotated in the same sense and each of which contains a suction insert, which is formed with a suction slot that faces the generally triangular space between the two suction drums. To permit the use of a lower suction flow rate and to ensure that this will not adversely affect the quality of the resulting yarn, each suction insert is mounted to be rotatable about the axis of the associated suction drum and positioning drive means are provided, which serve to rotate the suction inserts in mutually opposite senses and comprise two worm wheels, which are secured to respective stub shafts, which protrude axially from the suction drums and are secured to respective ones of the suction inserts, and two worm-carrying shafts, which are in mesh with respective ones of said worm wheels.

What is claimed is: 
     
       1. In apparatus for making a yarn, comprising two air-permeable, juxtaposed, closely spaced apart suction drums, which have parallel axes and define between them a generally triangular space and are mounted for rotation about said axes, and   two suction inserts, each of which is contained in one of said suction drums and has a suction slot, which extends generally along said axes and faces said generally triangular space,   each of said suction drums being mounted to be rotatable about its axis relative to the associated suction insert,   the improvement residing in that   each of said suction inserts is mounted to be rotatable about the axis of the associated suction drum for an adjustment of said suction slot relative to said generally triangular space,   positioning drive means are provided for rotating said suction inserts in mutually opposite senses about the axes of the respective suction drums, and   said positioning drive means comprise two stub shafts, each of which is secured to one of said suction inserts and protrudes coaxially from the associated suction drum, two worm gears, each of which is secured to one of said stub shafts, and two worm-carrying shafts, each of which is in mesh with one of said worm gears.   
     
     
       2. The improvement set forth in claim 1 as applied to such apparatus comprising a stationary frame, wherein said suction inserts are rotatably mounted in a frame and   each of said suction drums is rotatably mounted on one of said suction inserts.